Showing papers on "Styrene-butadiene published in 1971"
TL;DR: In this article, four starch derivative styrene butadiene elastomer (SBR) masterbatch compositions were selected for future optimization studies, the main factor remaining to be optimized is level of resorcinol-formaldehyde (RF) incorporation; but fine adjustment of such factors as starch loading and plasticizer incorporation is needed also.
Abstract: These studies allowed selection of four starch derivative styrene butadiene elastomer (SBR) masterbatch compositions for future optimization studies. The main factor remaining to be optimized is level of resorcinol-formaldehyde (RF) incorporation; but fine adjustment of such factors as starch loading and plasticizer incorporation is needed also.
Results in these experiments suggest that further study of certain high-amylose starch compositions might lead to masterbatches giving vulcanizates with both low water adsorption and good strength properties. Further work is also needed on oil-extension of starch derivative-SBR masterbatches.
Properties of selected starch-SBR masterbatches met requirements of the rubber industry for many end-use applications.
31 citations
Patent•
19 Jul 1971TL;DR: In this article, a non-slip instrument pad is disclosed, which is composed of a synthetic polymer foam material applied to a substrate, and the foam material is highly absorbent, has a high coefficient of friction and a low surface resistivity.
Abstract: A non-slip instrument pad is disclosed, which is composed of a synthetic polymer foam material applied to a substrate. The foam material is highly absorbent, has a high coefficient of friction and a low surface resistivity. The polymers used in making the foam are either styrene butadiene polymers or carboxylated styrene butadiene polymers. The foamed polymer contains an anti-static agent.
26 citations
TL;DR: In this paper, the sensitivity of the light scattering method in the determination of heterogeneity of the copolymer composition was discussed, and the composition heterogeneities thus established were generally low in contrast with a large number of literature data.
Abstract: Butanone/α-bromonaphthalene or cyclohexane/α-bromonaphthalene mixtures are solvent systems suitable for characterization and determination of the heterogeneity of chemical composition of the styrene/methyl methacrylate or styrene/butadiene copolymers by light scattering. The composition heterogeneities thus established were generally low, in contrast with a large number of literature data. Some styrene/butadiene block copolymers contain microgel particles which consist prevailingly of polybutadiene. A mixture of a homogeneous copolymer and a homopolymer is taken as an example to discuss the sensitivity of the light scattering method in the determination of heterogeneity of the copolymer composition.
Butanon/α-Bromnaphthalin- bzw. Cyclohexan/α-Bromnaphthalin-Gemische sind geeignete Losungsmittelsysteme zur Charakterisierung und Bestimmung der Heterogenitat der chemischen Zusammensetzung der Styrol/Methylmethacrylat- bzw. Styrol/Butadien-Copolymerisate mittels der Lichtstreuungsmethode. Die ermittelten Zusammensetzungsheterogenitaten waren zum Unterschied von einer Reihe von Literaturdaten durchweg niedrig. Einige Styrol/Butadien-Blockcopolymerisate enthalten vorwiegend aus Polybutadien bestehende Mikrogelteilchen. Am Beispiel des Gemisches aus einem homogenen Copolymerisat und einem Homopolymeren wird die Empfindlichkeit der Lichtstreuungsmethode bei der Ermittlung der Heterogenitat der Zusammensetzung der Copolymerisate diskutiert.
10 citations
TL;DR: In this paper, the dynamic storage and loss moduli of SBR 1503 reinforced with 400 A˚ polystyrene particles were measured at 110 cps over a 200° temperature range.
Abstract: The dynamic storage and loss moduli of SBR 1503 reinforced with 400 A˚ polystyrene particles were measured at 110 cps over a 200° temperature range. The effect of the polystyrene filler on the rubber was to raise the storage modulus dramatically in the rubbery zone, but only slightly in the glassy region of viscoelastic response. As a result the transition zone appeared broadened and shifted toward higher temperature. Corresponding changes were observed in the loss maximum with a shift of 4° at the highest filler content (46%) investigated. The height of the loss maximum was nearly unaffected. The loss tangent of the filled and unfilled polymers showed no systematic shift with temperature and the dilatometric glass transition was raised only 2° C at the highest filler content. All the essential features of the dynamic behavior could be described in terms of the properties of the component polymers by the phenomenological equivalent mechanical model treatment of Takayanagi. It is concluded that th...
8 citations
TL;DR: In this article, a review of the alkyllithium system of the copolymerization of butadiene and styrene is presented, including block and non-block copolymers of styrene butadienes, copylmers with functional groups, and copolicmers with varying microstructure.
Abstract: This paper is a review of the alkyllithium system of the copolymerization of butadiene and styrene. The alkyllithium system offer a very versatile tool by which a wide variety of styrene butadiene copolymers can be made to fit a particular application. Included are discussions of block and non-block copolymers of styrene butadiene, copolymers with functional groups, and copolymers with varying microstructure. In addition, wear and tractuion on a series of styrene butadiene copolymers with varying content and microstructure are presented.
Hier wird ein Uberblick uber die Copolymerisation von Butadien und Styrol mit Alkyl-Lithium-Initiatoren gegeben, mit denen eine grose Vielfalt von Butadien/Styrol-Copolymeren fur spezielle Anwendungen hergestellt werden kann. So werden Block-und Nichtblock-Copolymere, Copolymere mit funktionellen Gruppen und Copolymere mit verschiedener Mikrostruktur beschrieben. Ferner werden Daten uber die Abrieb- und Zug-Eigenschaften von Styrol/Butadien-Copolymeren mit unterschiedlichem Styrolgehalt und verschiedener Mikrostruktur angegeben.
7 citations
Patent•
01 Dec 1971TL;DR: In this article, a mixture of a FLUORINE CONTAINING POLYMER and a non-FLUORINE CONTAINing MATERIAL in AQUEOUS MEDIUM is presented.
Abstract: FUNCTIONAL SURFACE COATING COMPOSITIONS, PREPARED BY BLENDING A MIXTURE OF A FLUORINE CONTAINING POLYMER AND A NON-FLUORINE CONTAINING MATERIAL IN AQUEOUS MEDIUM, IMPART SOLVENT, GREASE AND OIL RESISTANCE TO CELLULOSIC MATERIALS.
6 citations
01 Jan 1971
TL;DR: In this article, the alteration in block copolymer structure which results from various treatments, and thus, aid in the elucidation of molecular behavior, was investigated by electron microscopy.
Abstract: The characterization and morphology of block copolymers have been the subject of many investigations in the last few years. Many block copolymer solutions are colored and films cast from them possess ordered structures. In a previous publication (l) ordered structures from clear and colored styrene-butadiene block copolymer films were discussed. The purpose of this investigation was to show, by electron microscopy, the alteration in copolymer structure which results from various treatments, and thus, aid in the elucidation of molecular behavior.
5 citations
TL;DR: In this article, the effect of heat treatment in the phase inversion region was studied using uncured mill blends of various commercial styrene, butadiene copolymer rubbers and general-purpose polystyrene resin (blend ratio, 80−40: 20−60, in wt-%).
Abstract: The effect of heat treatment in the so-called phase inversion region was studied using uncured mill blends of various commercial styrene—butadiene copolymer rubbers (styrene content, 23.5 to 48 wt-%; styrene block, 0 to 18 wt-%) with general-purpose polystyrene resin (blend ratio, 80–40: 20–60, in wt-%). It was found that the effect of heat treatment on the hardening or softening phenomenon of blends is different in the random type from that in the block-type styrene—butadiene copolymer rubber. A thorough discussion led us to conclude that this difference is caused by the strong interaction between the polystyrene block of the copolymer and the styrene homopolymer of general-purpose polystyrene resin.
2 citations
Patent•
07 Sep 1971
2 citations
TL;DR: In this paper, the softening phenomenon by remilling of uncured blends of various commercia styrene-butadiene copolymer rubber with general-purpose polystyrene resin was mainly studied by examining the blend ratio dependence of hardness and compression modulus, with special attention to the state of dispersion of polymers.
Abstract: The softening phenomenon by remilling of uncured blends of various commercia styrene—butadiene copolymer rubber (styrene content, 235 to 48 wt-%, styrene block 0 to 18 wt-%) with general-purpose polystyrene resin was mainly studied by examining the blend ratio dependence of hardness and compression modulus (in logarithmic form), with special attention to the state of dispersion of the polymers It was found that the blend of styrene—butadiene copolymer rubber with general-purpose polystyrene resin forms a microheterogeneous polymer blend system and that the hardness and the compression modulus change in S-shaped curves versus blend ratio However, the degree of softening phenomenon by remilling (roll surface temperature, 70°–90°C) was found to be different for the two blend systems, ie, random styrene—butadiene copolymer rubber and block styrene—butadiene copolymer rubber The softening phenomenon is more pronounced in random-type rubbers; and in some block-type rubbers, no softening phenomenon was observed The influence of the styrene content of the polymer is small Further discussions have shown us that the strong interaction between the polystyrene block of the copolymer and the styrene homopolymer of the general-purpose polystyrene resin controls the state of dispersion of polymers thereby causing this difference in the softening phenomena among the different kinds of styrene—butadiene copolymer rubbers
1 citations
01 Jan 1971
TL;DR: In this article, carboxylated rubber, styrene/butadiene/vinyl(or methylvinyl)-pyridine rubber, and α-methylstyrene or butadiene rubber are discussed.
Abstract: With notes on latex, carboxylated rubber, styrene/butadiene/vinyl(or methylvinyl)-pyridine rubber, and α-methylstyrene/butadiene rubber